Method for producing hot strips from lightweight steel

a lightweight steel and hot strip technology, applied in the direction of manufacturing tools, metal working devices, work heating devices, etc., can solve the problems of marred production of such steels with high manganese content, and achieve the effect of reliable realization of fine-grained steel

Active Publication Date: 2011-12-06
SALZGITTER FLASHSTAHL GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008]It is an object of the invention to provide a method for producing hot strips from a deformable lightweight steel which is especially suitable for cold deep drawing and which allows a reliable realization of a fine-grained, preferably isometric microstructure.

Problems solved by technology

The production of such steels of high manganese content has been marred by problems to ensure a fine-grained and isometric microstructure.

Method used

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  • Method for producing hot strips from lightweight steel
  • Method for producing hot strips from lightweight steel
  • Method for producing hot strips from lightweight steel

Examples

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Embodiment Construction

[0030]FIG. 1 illustrates schematically a process sequence according to the invention for the condition casting speed substantially equal to rolling speed. Upstream of the hot-rolling process is the casting process with a horizontal continuous strip casting installation 1, comprised of a revolving conveyor belt 2 and two deflection pulleys 3, 3′. A lateral seal 4 can be further seen to prevent the supplied melt 5 from flowing off to the right and left of the conveyor belt 2. The melt 5 is transported by means of a ladle 6 onto the horizontal continuous strip casting installation 1 and flows through a bottom opening 7 into a tundish 8. This tundish 8 is constructed as an overflow tank.

[0031]Not shown are the equipments for intense cooling of the underside of the upper strand of the conveyor belt 2 and the complete envelope of the continuous strip casting installation 1 with respective protective gas atmosphere.

[0032]After depositing the melt 5 onto the revolving conveyor belt 2, the i...

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Abstract

In a method for producing hot strips from a deformable lightweight steel which includes as main elements Fe, Mn, Si and Al, melt is cast close to its final dimension in a horizontal continuous strip casting installation under a protective gas to form a pre-strip between 6 and 20 mm, and the temperature of the pre-strip is adjusted after complete solidification and before the beginning of a hot-rolling process. The pre-strip is passed through a device under a protective gas for homogenization in concert with a selective maintenance of the temperature, cooling or heating, and subsequently subjected to a hot-rolling process having at least one pass with a total degree of deformation of at least 50%, and is then reeled as a hot strip following the cooling process. The hot-rolling process is executed in-line or in decoupled manner depending on the ratio of casting speed to rolling speed.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a method for producing hot strips from a deformable lightweight steel which is especially suitable for cold deep drawing and includes as main elements Fe, Mn, Si and Al and which has a high tensile strength and TRIP and / or TWIP properties.[0002]The method, set forth in the preamble, for producing hot strips from a deformable lightweight steel which is especially suitable for cold deep drawing is known (steel research 74 (2003), No. 11 / 12, pp 724-731).[0003]The production of such steels of high manganese content has been marred by problems to ensure a fine-grained and isometric microstructure.[0004]DE 197 58 108 C1 discloses a production method and production installation for continuous production of hot-rolled thin flat products. Melt from steel that has not been designated in greater detail is cast in a horizontal continuous strip installation close to its final dimension in a range between 5-18 mm and cooled in a controlled...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B22D11/00B22D11/12B21B1/46
CPCB21B1/26B21B1/463C21D8/0205Y10T29/49991B21B1/36B21B3/02B21B39/006B21B45/004B21B45/008B21B45/0209B21B2001/221B21B2001/228B21B2045/006C21D8/0226B21B1/34Y02P70/10B21B1/46C21D8/02
Inventor SPITZER, KARL-HEINZEICHHOLZ, HELLFRIEDSCHAPERKOTTER, MARKUSBORMANN, GUIDO
Owner SALZGITTER FLASHSTAHL GMBH
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